Pentair 071426 Collar and Rotor Union O-Ring Replacement Pool/Spa Cartridge and D.E. Filter Collar and rotor union o-ring replacement Fits Pentair Clean & Clear, Predator II Mini-Cellular Media, Clean & Clear/Predator cartridge pool and spa filters Also fits Pentair Warrior, EasyClean, SM & SMBW 2000 series pool and spa D.E. filters Measures 2-5/8-inch length by 1/4-inch height by 2-5/8-inch width